config/lua: init lua config manager, use lua if available (#13817)

Adds a new lua config manager, which will automatically be used if there is a lua config present.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/config/lua/objects/LuaObjectHelpers.hpp b/src/config/lua/objects/LuaObjectHelpers.hpp
new file mode 100644
index 00000000..69c284ef
--- /dev/null
+++ b/src/config/lua/objects/LuaObjectHelpers.hpp
@@ -0,0 +1,51 @@
+#pragma once
+
+#include "../bindings/LuaBindingsInternal.hpp"
+
+#include "../../../helpers/memory/Memory.hpp"
+
+extern "C" {
+#include <lauxlib.h>
+}
+
+namespace Config::Lua::Objects {
+
+    template <typename T>
+    inline int gcRef(lua_State* L) {
+        sc<T*>(lua_touserdata(L, 1))->~T();
+        return 0;
+    }
+
+    inline int readOnlyNewIndex(lua_State* L) {
+        return Config::Lua::Bindings::Internal::configError(L, "attempt to modify read-only hl object");
+    }
+
+    inline void registerMetatable(lua_State* L, const char* name, lua_CFunction indexFn, lua_CFunction gcFn, lua_CFunction eqFn = nullptr, lua_CFunction toStringFn = nullptr) {
+        luaL_newmetatable(L, name);
+        lua_pushcfunction(L, indexFn);
+        lua_setfield(L, -2, "__index");
+        lua_pushcfunction(L, readOnlyNewIndex);
+        lua_setfield(L, -2, "__newindex");
+        lua_pushcfunction(L, gcFn);
+        lua_setfield(L, -2, "__gc");
+
+        if (eqFn) {
+            lua_pushcfunction(L, eqFn);
+            lua_setfield(L, -2, "__eq");
+        }
+
+        if (toStringFn) {
+            lua_pushcfunction(L, toStringFn);
+            lua_setfield(L, -2, "__tostring");
+        }
+
+        lua_pop(L, 1);
+    }
+
+    class ILuaObjectWrapper {
+      public:
+        virtual ~ILuaObjectWrapper()     = default;
+        virtual void setup(lua_State* L) = 0;
+    };
+
+}